Mortal Sins examines the motivations of the characters in this episode with a flashback analysis of episodes 1-4. Lucifer, Maria, and Levi all have different needs and desires, but they still came together as a team to help fight the Mortal Sins. There's plenty more to come.
and it turns out there was a secret 
which Lucifer entrusted to Maria.
Und offenbar vertraute Luzifer
Maria ein Geheimnis an.
Y hay un secreto que Lucifer
le confió a Maria.
Y hay un secreto que Lucifer
le confió a Maria.
C’est alors que Lucifer leur révéla
ce qu’elle leur avait caché.
e si scopre che Lucifer
ha affidato un segreto a quest'ultima.
Mas havia um segredo que
Lúcifer confiara a Maria.
а затем выясняется, что у Марии есть секрет, что 
был ей доверен падшим ангелом по имени Люцифер.